Analysis On Formation Mechanism And Stability Of Landslide In Wan Tang Government Address,Pingbian County

As a mountainous province,Yunnan Province is a major province for the development of landslide due to its unique regional climate characteristics.Frequent geological disasters have seriously hindered local economic construction and social development.And related supporting system construction.Based on the experience of landslide geological disaster control project in Yunnan Province in the past six years,this paper selects the government seat of Wantang Township in Pingbian County as the research object.Through the field investigation,exploration,test and monitoring of landslide,the combination of qualitative analysis and quantitative calculation is used to study the development characteristics,genetic mechanism,stability and control strategies of landslide.The research results of this paper are summarized as follows:(1)The landslide is located in the middle and low mountainous landforms.The front edge has eroded and accumulating valleys with a slope of 20-40°;the upper part of the slope is the Quaternary residual slope,and the lower part is the Proterozoic Yaoshan Group.The black cloud slanted gneiss,the rock stratum is relatively broken,the texture at the interface of the geotechnical layer is weak and the water content constitutes a controlled weak structural surface.The landslide is a small traction landslide.(2)According to the signs of landslide deformation and monitoring data,the landslide is currently in the stage of creep deformation,and no overall slip occurs.After analysis,the topography,geotechnical properties,geological structure and other factors are the internal causes of landslides,and rainfall is an important cause of landslide deformation and damage.(3)The limit equilibrium line method and Midas GTS software are used to quantitatively evaluate the stability of the landslide.The stability calculation results show that the landslide is in a basically stable state under natural conditions;the landslide is unstable under heavy rain conditions;the landslide is in earthquake Under the condition of being unstable and basically stable.The calculation results are basically consistent with the actual situation.(4)According to the development characteristics and dangers of the Houshan landslide of the Bayang Township Government,considering the protection objects and construction conditions,a comprehensive treatment plan of “anti-slide piles + anchor sash grids + intercepting drainage ditch” was proposed.A row of anti-slide piles is arranged at the front edge of the landslide,and a cable sash beam is arranged near the trailing edge of the landslide,and a drainage ditch is arranged along the landslide.Practice has shown that the above measures have a good governance effect.